import axios from 'axios'
import Vue from 'vue'

// 跨域认证信息 header 名
const xsrfHeaderName = 'Authorization'

axios.defaults.timeout = 30000
axios.defaults.baseURL = process.env.VUE_APP_API_BASE_URL
// axios.defaults.withCredentials = true
axios.defaults.xsrfHeaderName = xsrfHeaderName

// 认证类型
const AUTH_TYPE = {
    BEARER: 'Bearer',
    BASIC: 'basic',
}

// http method
const METHOD = {
    GET: 'get',
    POST: 'post',
    DOWNLOAD: 'download'
}

/**
 * axios请求
 * @param url 请求地址
 * @param method {METHOD} http method
 * @param params 请求参数
 * @returns {Promise<AxiosResponse<T>>}
 */
async function request(url, method, params, config) {
    switch (method) {
        case METHOD.GET:
            return axios.get(url, { params, ...config })
        case METHOD.POST:
            return axios.post(url, params, Object.assign({},
                {
                    transformRequest: [function (data) {
                        let formData = new FormData();
                        for (let key in data) {
                            formData.append(key, data[key]);
                        }
                        return formData;
                    }]
                }, config))
        case METHOD.DOWNLOAD:
            return axios.get(url, {responseType: 'blob'}).then(res => {
                console.log(res)
                let name = res.headers['content-disposition'].replace('attachment; filename=', '');
                let a = document.createElement('a');
                a.download = decodeURI(name);
                a.href = URL.createObjectURL(res.data)
                a.click();
            })
        default:
            return axios.get(url, { params, ...config })
    }
}

function download(url) {
    return Axios.get(url, {responseType: 'blob'}).then(res => {
        console.log(res)
        let name = res.headers['content-disposition'].replace('attachment; filename=', '');
        let a = document.createElement('a');
        a.download = decodeURI(name);
        a.href = URL.createObjectURL(res.data)
        a.click();
    })
}

/**
 * 设置认证信息
 * @param auth {Object}
 * @param authType {AUTH_TYPE} 认证类型，默认：{AUTH_TYPE.BEARER}
 */
function setAuthorization(auth, authType = AUTH_TYPE.BEARER) {
    switch (authType) {
        case AUTH_TYPE.BEARER:
            Cookie.set(xsrfHeaderName, 'Bearer ' + auth.token, { expires: auth.expireAt })
            break
        case AUTH_TYPE.BASIC:
        case AUTH_TYPE.AUTH1:
        case AUTH_TYPE.AUTH2:
        default:
            break
    }
}

/**
 * 移出认证信息
 * @param authType {AUTH_TYPE} 认证类型
 */
function removeAuthorization(authType = AUTH_TYPE.BEARER) {
    switch (authType) {
        case AUTH_TYPE.BEARER:
            Cookie.remove(xsrfHeaderName)
            break
        case AUTH_TYPE.BASIC:
        case AUTH_TYPE.AUTH1:
        case AUTH_TYPE.AUTH2:
        default:
            break
    }
}

/**
 * 检查认证信息
 * @param authType
 * @returns {boolean}
 */
function checkAuthorization(authType = AUTH_TYPE.BEARER) {
    switch (authType) {
        case AUTH_TYPE.BEARER:
            if (Cookie.get(xsrfHeaderName)) {
                return true
            }
            break
        case AUTH_TYPE.BASIC:
        case AUTH_TYPE.AUTH1:
        case AUTH_TYPE.AUTH2:
        default:
            break
    }
    return false
}

/**
 * 加载 axios 拦截器
 * @param interceptors
 * @param options
 */
function loadInterceptors(interceptors, options) {
    const { request, response } = interceptors
    // 加载请求拦截器
    request.forEach(item => {
        let { onFulfilled, onRejected } = item
        if (!onFulfilled || typeof onFulfilled !== 'function') {
            onFulfilled = config => config
        }
        if (!onRejected || typeof onRejected !== 'function') {
            onRejected = error => Promise.reject(error)
        }
        axios.interceptors.request.use(
            config => onFulfilled(config, options),
            error => onRejected(error, options)
        )
    })
    // 加载响应拦截器
    response.forEach(item => {
        let { onFulfilled, onRejected } = item
        if (!onFulfilled || typeof onFulfilled !== 'function') {
            onFulfilled = response => response
        }
        if (!onRejected || typeof onRejected !== 'function') {
            onRejected = error => Promise.reject(error)
        }
        axios.interceptors.response.use(
            response => onFulfilled(response, options),
            error => onRejected(error, options)
        )
    })
}

/**
 * 解析 url 中的参数
 * @param url
 * @returns {Object}
 */
function parseUrlParams(url) {
    const params = {}
    if (!url || url === '' || typeof url !== 'string') {
        return params
    }
    const paramsStr = url.split('?')[1]
    if (!paramsStr) {
        return params
    }
    const paramsArr = paramsStr.replace(/&|=/g, ' ').split(' ')
    for (let i = 0; i < paramsArr.length / 2; i++) {
        const value = paramsArr[i * 2 + 1]
        params[paramsArr[i * 2]] = value === 'true' ? true : (value === 'false' ? false : value)
    }
    return params
}

export {
    METHOD,
    AUTH_TYPE,
    request,
    setAuthorization,
    removeAuthorization,
    checkAuthorization,
    loadInterceptors,
    parseUrlParams
}
